[v1] xen: pvh: Add machine option to disable the mapcache

[PATCH v1 0/5] xen: pvh: Add machine option to disable the mapcache

Edgar E. Iglesias posted 5 patches 1 month, 1 week ago

Diff against v1
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git fetch https://github.com/patchew-project/qemu tags/patchew/20260304015222.979224-1-edgar.iglesias@gmail.com

Maintainers: Stefano Stabellini <sstabellini@kernel.org>, Anthony PERARD <anthony@xenproject.org>, Paul Durrant <paul@xen.org>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Eduardo Habkost <eduardo@habkost.net>, "Michael S. Tsirkin" <mst@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Peter Xu <peterx@redhat.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>

There is a newer version of this series

hw/i386/xen/xen-hvm.c           |   2 +-
hw/xen/xen-hvm-common.c         |  18 +++--
hw/xen/xen-mapcache.c           |  16 ++++
hw/xen/xen-pvh-common.c         | 134 +++++++++++++++++++++++++++++---
hw/xen/xen_stubs.c              |   5 ++
include/hw/xen/xen-hvm-common.h |   3 +-
include/hw/xen/xen-pvh-common.h |   2 +
include/system/xen-mapcache.h   |   1 +
system/physmem.c                |  13 ++--
9 files changed, 169 insertions(+), 25 deletions(-)

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[PATCH v1 0/5] xen: pvh: Add machine option to disable the mapcache

Posted by Edgar E. Iglesias 1 month, 1 week ago

From: "Edgar E. Iglesias" <edgar.iglesias@amd.com>

This adds a mapcache option to the PVH machines allowing users to disable the
mapcache. To remain backwards compatible, the option defaults to "on".

When disabled, all guest memory is mapped at startup rather than on demand.
Starting QEMU may take longer in this mode, but runtime overhead is reduced and
it also enables virtio vhost backends to work.

As a trade-off, grants are unavailable without the mapcache and guests with
large amounts of RAM can take quite a while to start.

Cheers,
Edgar
 
Edgar E. Iglesias (5):
  xen: mapcache: Assert mapcache existance
  xen: mapcache: Add function to check if the mapcache is enabled
  physmem: xen: Conditionalize use of the mapcache
  hw/xen-hvm: Add a mapcache arg to xen_register_ioreq()
  hw/xen: xenpvh: Add prop to enable/disable the mapcache

 hw/i386/xen/xen-hvm.c           |   2 +-
 hw/xen/xen-hvm-common.c         |  18 +++--
 hw/xen/xen-mapcache.c           |  16 ++++
 hw/xen/xen-pvh-common.c         | 134 +++++++++++++++++++++++++++++---
 hw/xen/xen_stubs.c              |   5 ++
 include/hw/xen/xen-hvm-common.h |   3 +-
 include/hw/xen/xen-pvh-common.h |   2 +
 include/system/xen-mapcache.h   |   1 +
 system/physmem.c                |  13 ++--
 9 files changed, 169 insertions(+), 25 deletions(-)

-- 
2.43.0